That's also something that WW talks about...at least when I did it. They suggested you look to losing 10% of your total loss. Then you go for the next 10%. I love the idea of losing part, stopping, then keeping that off for a while before starting on the next amount.
This makes perfect sense to me. I have had years and years where I maintained a certain weight, with no gaining, no losing. When I did gain, I lost back to that level fairly easily, but then plateaued and could not lose more without a terrible struggle. I always said my body liked weighing that weight. Apparently, I was right.